I understand where you are coming from.
My 45yr old brother lives with my parents. He doesn't work, he contributes nothing. He has a house (owned outright, inherited) that he rents out for cash, while he lives with my parents. They cook for him, do all the cleaning, washing etc, buy the food. He does nothing. No help round the house, no gardening, no shopping, not even keeping his own room tidy or own clothes washed. He acts like an entitled 15yr old.
I moved out, married, had children. My parents often can't come to visit because they have to cook brother's dinner, or need to give brother a lift somewhere etc. My wants and needs always come second to making his life easier. I never, ever get to see them without him, if I invite them for dinner, he comes too, my parents just seem to assume the invitation is for them all, and I feel it would be petty to object to this in any way.
Financially they're very generous, but everything they do for my children, they give my brother the cash equivalent. So pay for football subs for my son, but give my brother the equivalent amount in cash. They think this is fair, but of course I never get compensated for them buying his food, paying his living costs, driving him around, buying his clothes etc. I wouldn't want to tbh, but it feels like one rule of fairness for him, another for me. Surely either its either absolutely equal or according to need? But my parents seem to keep swapping which system they use, depending which one works in brothers favour.
At Christmas, my parents let me know what they and my brother wanted for presents, and was chased to buy them (especially my brothers, he wanted something specific). I, DH and DCs got presents. The labels weren't written on, so I asked who they were from..."us". "Us" is apparently the unit of DM, DF and B, excluding me. I had a few tears in the loo . I feel totally excluded. Like I'm not part of the core family unit, more a distant relative. I live locally, and visit phone several times a week, plus do lots of the running round for my parents, fitting it around f/t work, volunteering and my own young family. It's very hurtful to feel left out of the core unit, and I can totally sympathise with the OP.