Glancing quickly through the answers you've received, I don't see one possible solution to part of your problem.... that of them saying you have to have their permission to leave your kids with your mother. You mention that your mother has the children for about an hour on Thursday evenings. What is the possibility that you could pick your mother up and bring her to your home to watch your children and then take her home afterward?
I'm assuming your brothers are charging your mother something from her social security for living in the apartment (which, by the way, makes their assumption that you and your sister each "owe" them $400 a month not make sense when computed out... $1200 divided among the four siblings would only be $300 a month, (and since the brothers have the advantage that they are the ones building up the equity in the building, them having an equal share in the cost of your mother's apartment rent seems reasonable). If your mother is also contributing, then the amount for each sibling should be less it would seem.
I would have a talk with your mother, if I were you and find out if you rent a larger place where she could move in with you, would she be able to help with the higher cost of your place so you could do that. If you work out such an arrangement, I would then let the brothers know they can have their apartment to rent out and that they won't have to worry about your mom's care because you have taken it over. Depending on your relationship with your sister, you may want to talk to her about the two of you taking care of your mother, but if she isn't on board with the plan, it seems it would be better for you to simply take over if you can.
Updated
Glancing quickly through the answers you've received, I don't see one possible solution to part of your problem.... that of them saying you have to have their permission to leave your kids with your mother. You mention that your mother has the children for about an hour on Thursday evenings. What is the possibility that you could pick your mother up and bring her to your home to watch your children and then take her home afterward?
I'm assuming your brothers are charging your mother something from her social security for living in the apartment (which, by the way, makes their assumption that you and your sister each "owe" them $400 a month not make sense when computed out... $1200 divided among the four siblings would only be $300 a month, (and since the brothers have the advantage that they are the ones building up the equity in the building, them having an equal share in the cost of your mother's apartment rent seems reasonable). If your mother is also contributing, then the amount for each sibling should be less it would seem.
I would have a talk with your mother, if I were you and find out if you rent a larger place where she could move in with you, would she be able to help with the higher cost of your place so you could do that. If you work out such an arrangement, I would then let the brothers know they can have their apartment to rent out and that they won't have to worry about your mom's care because you have taken it over. Depending on your relationship with your sister, you may want to talk to her about the two of you taking care of your mother, but if she isn't on board with the plan, it seems it would be better for you to simply take over if you can.
Updated
Glancing quickly through the answers you've received, I don't see one possible solution to part of your problem.... that of them saying you have to have their permission to leave your kids with your mother. You mention that your mother has the children for about an hour on Thursday evenings. What is the possibility that you could pick your mother up and bring her to your home to watch your children and then take her home afterward?
I'm assuming your brothers are charging your mother something from her social security for living in the apartment (which, by the way, makes their assumption that you and your sister each "owe" them $400 a month not make sense when computed out... $1200 divided among the four siblings would only be $300 a month, (and since the brothers have the advantage that they are the ones building up the equity in the building, them having an equal share in the cost of your mother's apartment rent seems reasonable). If your mother is also contributing, then the amount for each sibling should be less it would seem.
I would have a talk with your mother, if I were you and find out if you rent a larger place where she could move in with you, would she be able to help with the higher cost of your place so you could do that. If you work out such an arrangement, I would then let the brothers know they can have their apartment to rent out and that they won't have to worry about your mom's care because you have taken it over. Depending on your relationship with your sister, you may want to talk to her about the two of you taking care of your mother, but if she isn't on board with the plan, it seems it would be better for you to simply take over if you can.