Am I over reacting??

First let me say me and my husband have been together 8 years. We moved in together 7 years ago I was 21 and he was 23. It was tough we both are in trades so we were starting from the bottom. We also bit off more then we could chew. Our first apartment was a sky line condo on a river. We were house poor. My mom would

Always buy extras at Costco and lie about “buying to much” pack them in Kroger bag

So my husband wouldn’t realize we were getting help. Fast forward 2 years ago we finally are debt free other then one car. Last year my husbands job hit a rough patch and he was offered and amazing opportunity to work for a internationals company but he would have to travel. It didn’t matter we were finally getting out of a hole we didn’t want to go back in so he did it. He was gone 6 days a week and would travel 4 hours home every Saturday night and leave again Sunday night 4 hours back. We sacrificed a lot to be where we are financially. We splurged a little after a bit we decided we need to save for a new home and we would want to start ttc. So now to my problem. His family has always borrowed money from us as long as I can remember. His mom likes to gamble and hides it from her husband and his dad was in a bad accident (not really an accident) 20 years ago he was a douche bag before but a bigger one now big drinking and drugs in his background. It was always 20 here or there maybe a hundred or more every once in a while but since he started this job it’s been insane. His mom borrowed $360 in August she made us promise to not tell her husband and she would pay us back then his dad called In September crying because he needed new shoes and the ones he wasted were $120. We gave it to him when he said he would pay us back then a week later his momCalled needing $700 we said no she freaked saying she would always help us (she won $40,000 at the bingo and gave us 1500 to pay off one of my husbands credit cards) blah blah blah so my husband caved she said she would pay us back 100 every two weeks. Then last Sunday my father in law asked us for $450 I said no this is a joke it’s been two months and we’re out 2 grand. But my husband said it was for Christmas gifts since he is disabled now and has 5 kid. So I went upstairs went on Facebook and his dad made a post saying this was his next purchase it was a machine that turned your weed into oil and the retail price was $400 so I showed my husband he was upset and said no we won’t give it to him. A week after him texting and calling everyday my husband just gave him the money. THEN we were going to take my mother in law and her husband to dinner this past Saturday for her birthday but my husband has been sick we asked if we could

Do it next weekend and she said yes of course then yesterday my husband phone was blown up by her because she asked if she could just get the money from her birthday dinner instead of the dinner. I’m dumb founded my husband said no but like he said no every other time and does it anyway. I don’t know how I should show him he’s not responsible for his parents bad actions. He blames me not understanding because I came from a somewhat wealthy very stable house hold and he grew up poor but I don’t think that’s it at all it’s not like they are short on cash and don’t have grocery’s I would understand but their gambling/drinking/drug we finally have a good saving and we have our 2 grand over the last two months and neither have even tried to pay us one payment. What do I do???