L.C.
Set aside two days a week for play days. On those two days Davey, or anyone else, can come over and play. Tell her you are trying to get your daughter on a schedule so that she knows the days you go to visit friends and family and days she can have visitors, this way you avoid fits. Before you go on a walk invite Davey and an adult to come along. Tell them at that time that you would like Davey to come, but with the baby and your own three year old you would like an extra set of hands and eyes if he is coming with you. If no one is willing to go just say, "Oh, that's too bad. Maybe next time." The key is to be proactive and address the situations before they come up and you have to say no.