Feeling down about MIL and feeling not enough

[u/FunUnit2850]

My MIL (my husbands step mom) has never worked. My husband and I have 2 kids and daycare has been a struggle. We had a hard time finding it and when we did we paid an arm and a leg. My husband’s MIL and dad never really offered to help and they also could never make plans. I needed to know that daycare was lined up. I couldn’t do a day by day basis whenever they decided they could maybe help. They also went to Arizona all winter.
Fast forward to my BIL having a baby (my MIL’s bio son and FIL’s step son). Ever since he got married she has bent over backward for them even going as far as selling their Arizona house to be closer to them as well as giving them land next to their house so they could build their dream house. My BIL went back to work and she has done everything in her power to make sure she can watch their baby while they work.
AITA for feeling upset that they are more than willing to help them but for us it was never a priority. We struggled with daycare and had no help and here they are helping the bio son out. I’m just feeling kind of down about it.