Do you buy for the "steps" in your family - nieces, nephews, etc.?

I have always bought for my huband's side of the family when someone graduated HS (no one made it to college), got married, had kids, etc. But when my daughter got married his sisters nor my stepsons (both are married) got her a gift. Now that she is due to give birth any day, they have still not sent a gift. My kids are the "steps" in the family and only my MIL buys a gift. I wouldn't get upset except when my stepsons got married & had kids, my husband's sisters got them gifts plus at Christmas they bring the gifts for us to give to the grandkids (the ones that are "blood" related). I have already said that this year at Christmas, if they do not bring a gift for every grandchild then they will have to take the gift to the child themselves. They also buy gifts for friends of the family when anyone gets married or has kids but leave my kids out of all of it. Even at Christmas one year the 2 sisters asked their mom if they should include my kids in drawing names since they are not "really related". I blew up and my husband stepped in and told them not to include any of us since that was how they felt. That was several years ago and my MIL put a stop to drawing names at Christmas because of my SIL's acting like that. These same sisters do not call to check on their brother (even when he was in the hospital) but when they saw me out in public they put on such an act of how worried they were, how much they love him, etc. They got mad because I wouldn't babysit with their kids all the time when we first got married. After they found out they didn't have a babysitter so they could go out every weekend (they go to the local bar) they didn't want much to do with me. That part is fine with me but if they don't acknowledge my daughter & my grandchild, should I take the high road and continue to buy for the special times in their families or just tell my husband - you do it (he won't shop, just hand over money). I don't even want a penny of our money to go to them since they feel like this but I try to keep the peace.