AITA for not sharing my homeless shelter with my son’s ex fiancé and her parents

I was in a 15 year relationship that ended 8 years ago. My ex got pregnant with my son when we were still in high school and with the help of financial assistance and the support of our parents we were able to provide for him and finish high school. Unfortunately neither of us went to college and I struggled to find a job for years after high school and had to move back in with my father. I am close with my son and see him a couple of times a week.<br><br>My son is 22 now and I was over the moon when he got engaged to his long term girlfriend last year. I was excited to be a father of the groom. I have been saving up for years to get my own place and last year I was finally able to afford a studio apartment. With my son planning to get married next year I figured we wouldn’t see each other as often when he has a wife and maybe kids so I made the most of the time we had left by spending a lot of time with him.<br><br>I was really looking forward to seeing my son get married and was happy to welcome my son’s fiancé into the family. I never had a problem with her and was even the one who encouraged my son to propose. So I was shocked when he broke up with her last April when she fell pregnant. He told me that he didn’t think they were compatible and felt trapped. I was disappointed but told him it was his decision and he had to follow his heart. They stayed in contact for the sake of their child and I continued to see a lot of my son.<br><br>At the end of the year my son’s ex gave birth to a baby girl. My son is with her a lot because he wants to be involved in her life. He told me that he still doesn’t love his babies mother and is just around because of the baby. I told him she deserves better and to treat her nicely. He asked me if I could regularly babysit because he is worried that his son’s mother will get lonely. I agreed.<br><br>Last month my apartment burnt down because of a fire. It was fully stocked with everything I needed to live from furniture to utensils to plates so I lost a lot when it burnt down. They are also currently doing renovations so I will have to wait a few months to move back in. The council have put me up in a homeless shelter. We aren’t allowed to have overnight guests.<br><br>My son’s ex is having a really hard time dealing with her babies colic and has been struggling with PND. She also doesn’t have a car so relies on my son to take her out. He has suggested that her and the baby move in with me and my son at the homeless shelter because she has post-natal depression and needs my help. He also said that he invited her parents to homeless shelter as well because they are worried about their daughter and want to be there to help. They don’t have a spare room and it’s a 3 hour car journey for them to drive and visit every day.<br><br>I refused and told my son that the shelter is meant for me and him, not 4 people. I also told him that it’s a homeless shelter not a family home and his son’s mother has a home to live in. I told him that she can come and visit during the day but not to stay overnight. He asked me if her parents can stay but I also declined. He had an argument with me and said I have no compassion and am a horrible grandather for turning away my grandson and his family.<br><br>AITA?