SIL keeps asking my husband for money. Any advice please??

My husband is AD (active duty), he has a sister and her husband is AD as well. His sister and her husband are in an unfortunate situation because her husband came up positive on a drug test for CBD. He says he’s never smoked and offered another test on the spot but was rejected. My SIL does smoke weed pretty often (always has a stash) kind of smoke. Idk if that could be a reason he came out positive? Anyways I don’t 100% believe their story because it hasn’t been consistent. They were about to move to another duty station and now they are on hold because there is a case opened against the husband to see if he’ll be discharged or not. They are also expecting baby #2. Given the husbands situation they reduced his pay and took his rank and now has to work extra hours. I feel like already in a lot of peoples situation money is tight. With everything going on around the world I get it.. My husband and I are set to move to another duty station as well in a couple months and we have money saved up for the move and other things we will be needing. I have been a stay at home mom since my daughter was born while we were stationed over seas and coming our next duty station I have plans of my own to advance in my own personal goals (go back to school, and work) I’m very excited about that and we are budgeting very tightly and already have our expenses planned out. That being said, his sister is also a SAHM and hasn’t worked since she was 23 (27 now) and keeps asking my husband for money.. this isn’t the first time. Through out our relationship (5yrs) she has always asked us for money to get by but always payed us back. Before I had my daughter I used to work full time and go to school. So that was never a problem. But now she has asked my husband for money a second time but hasn’t paid back the first. And knowing their current situation one income, reduced pay, baby #2 on the way, I don’t think they’ll be paying us back. Not to mention they live in a more expensive state. I feel like this is an awkward situation.. I feel really bad but we are just making it enough on my husbands income I came back to the U.S and worked for a couple months and that really helped us but our day care situation wasn’t working so I am now waiting for my husbands return so we can make our next move. How would one handle this situation without making it awkward? I hate confit and the way this is going we will be dipping into our own savings or not being able to continue to save for a big move we have coming up in a couple months.. my husband loves his sister I do too! We get along great. He has 3 other siblings who have all continuously depended on and still depending on his parents and they see my husband and I as a more stable family because we never ask them for money or help😭 which isn’t totally true because when I was still living overseas with my husband we were barley getting by just tight budgeting and living check to check. I do sympathize with their situation but in the end I feel like I need to think about my family first.. I feel like that is selfish and we should help out in any way we can but I feel un easy with where this could go.. please any advice? Is there any way we could help that isn’t money? I need advice any is appreciated.