Not a good christmas this yr😞😡

So my husbands ex wife is driving us nuts literally....when me an my husband met he was a single dad of 2 an me a newly single mom of 1 well me & my husband have decided to get full custody now shes saying his daughter isnt his witch has torn him apart let me just say she abounded the kids to be with another man she has not seen them in abt 4 months calls once a month to talk to them so me an my husband decided to get full custody well she found out an called us up the other night she told my husband that his daughter hes raised may not be his after that i never seen my husband once cry until then he broke down to me i told him that no matter what shes ur daughter we can get through this now we have to get a DNA test done an if shes not his she goes with her mom an honestly im scared of that. She abounded her kids once for a new bf she has so she could party an get high she post on facebook so much abt getting high an drinking the kids havent seen her in 4 months im so stressed an on topof everything my husbands mom is in the hospital they dont think she will make it to christmas my husband is such a good loving man i dont understand why all this has to happen i feelso bad idk what to do for him i wish there was more i could do😞😞😪 i need friends to talk too .