Hello NaturalBlondeYeahRight and welcome.
Difficult situation I agree, but it's not up to you to sort out or interfere, it's for your children to do and learn from. I know it's hard to not try to fix everything, but sometimes taking a deep breath, being fair to both, listening without judging and being there and respecting their confidence is all you can and should do.
Couple of red flags in your post, never pay for advice or guidance in areas you know nothing about. And don't mess with stuff you know nothing about.
You have a currently unpleasant situation, but spells, or anything else you are not familiar with shouldn't really be your first port of call.
You can help by creating a calming atmosphere at home, investigate space clearing, loads that you can do with a few drops of salt water, bells/chimes and visualising love and harmony coming in and filling your house as discord and negativity leaving.
Salt lamps, Rose quartz, relaxing essential oils can all help, but they are not something you should splash out on with the belief they will change the situation.
Much as you want to sort this situation out, taking a back seat is often the best strategy.
Apologies to everyone for my absence of late, I'm dealing with some major health stuff. I may be quiet, but I do read to try and keep up with everyone.
Hedgewitch I am 11 years down the path you are now on, it's* not an easy journey. *
You are all in my thoughts, candles burn for you when you need support, I wish you all some tranquility before the next storms approach.