My husband's brother has severe anxiety and depression and can't work. I've never met him (DH and I have been together nearly 10 years) but I do feel some responsibility to help him: after all, he is family and I hope that one day, when he is ready, I will get to meet him. We occasionally buy him food if he doesn't have any or pay his electric/gas bills so he has warmth. He was recently asked to leave the place he was renting and doesn't have any money to rent a new place (he is on disability and, from what I understand, has been using this until now to pay rent but now doesn't have any money for a renters deposit).
He has asked DH if we will please be his guarantor on a new place. He has a history of non-payment of rent and doesn't manage his money very well (not that that is my business usually but in this case, I think it's relevant).
I've said to DH I am not comfortable doing it. I want to help. We can send food and pay for bills but we can't be ultimately responsible for his rent ongoing. We have a baby due in 3 weeks as well, so our responsibilities, financially, are going to increase without having to potentially pay living costa for a fully grown man.
Husband isn't sure what to do, and I get why he's upset by the situation. Am I being unreasonable by putting my foot down on what we will pay for my brother in law?