S.K.
You know - if the lawsuit does close prior to your divorce you MAY be eligible for 1/2 of the money. There have been cases where someone has won the lottery and waited until their divorce was final prior to collecting. They were forced to pay 1/2 of their earnings to their ex-spouse b/c the winnings were won during the divorce.
Also - in MA even after you sign the divorce papers it takes a year to ratify the divorce. There was a case where the husband and wife were divorced and the husband was killed skiing - but it had not yet been a year from them signing the divorce papers.... the (ex) wife got everything in his estate. Sad for the kids that they lost their dad... but good for the wife b/c as he did sleep w/ the underage babysitter.
My point is I think if you're still legally married you are entitled to 1/2 of whatever he gets in any lawsuit. I would talk to a lawyer PRIOR to signing ANYTHING. Who knows... maybe your 1/2 of the settlement will be more than enough to pay off your parents.