Just got out of hell just to fall back in...URGENT ADVICE NEEDED!!

So it seems i am once again put into another predicament and i feel selfish and shitty, my husband and i are married for 6 years now, we dated since i was 16 years old we basically grew up together because he moved in with myself and my parents, himself and his mom lost their house and my parent's offered them a place to stay(i begged), we didnt have much so myself my now husband and his mom lived-in one room and i had to Cope, fast forward 10 years later both my parents passed away since it was a battle and felt like living in hell with my now mother in law she was overbearing causing myself and my husband to feel like siblings i had to BEG HER that my husband and i need space infact now that i think about it i have never in my life felt what its like to live on my OWN anyway I have 2 kids now not to long ago iv managed to set boundaries and she has a room elsewhere that she is renting she is elderly, things are much better and healthier NOW my husband has an older brother and an older sister, my husbands sister took in her older brother since coming out of rehab since losing their home he went his own way which ofcause led him to drugs because she has the means she took him in after he recovered he looks really decent now if I must say so myself...SHE is doing pretty well for herself as a social worker and her husband has an amazing job he however works away most of the time, recently my sis in law and her husband had an argument about family, my sis in law kicked out her mother in law and now that her husband is back he decides her brother should leave as well, my husband has now become responsible for yet another human being, we now have a deadline since "her husband and herself has already discussed that he should leave by friday" Check this, we can barely afford rent, i am unemployed looking after my 2 year old and 5 year old, my husband has a shitty job too we trying to find our feet GOD iv been searching for my feet...my husbands brother has a criminal record since being clean and off the streets therefore he only receives weekly salary its not enough to survive on! How can we help others if we cant help ourselves, my husband is soft and barley speaks up for himself...i don't want him to resent me AGAIN, rn i remember my moms words i asked for her blessing before my husband proposed before she died she asked "my daughter can you handle his burdens??"... What do i do??