How do you cope with in laws who may be ghosting you to take advantage of an elderly relative - or am I bring really cynical? Don’t flame me calm me down plse

[lockdownmu]

We are having to stop en route to the south coast to pick up my MIL tomorrow.
She has lived with her daughter (my SIL) since lockdown started and we are taking her down to her flat in Dorset so she can let it out. We are staying there as a break and to help her sort that out.
But SIL has frozen out my DH for years. MIL gave SIL a few hundred grand to buy the house they now live in.
SIL and her DH sold their house and used that money and MIL's money to buy a bigger property - it did cause my DH some heartache not because he's greedy but because the whole thing felt unfair - but we've moved or tried to.
MIL has still not set up a power of attorney but she says she will this week.
Anyway SIL has definitely gone cold on DH since marrying her husband who is someone who likes setting up businesses.
Every time we go and see MIL SIL and her DH have different people over (MIL is in our bubble). So they can't spend time with us.
I'm worried that this is some grand plan to ghost us so we don't see MIL - I'm already concerned SIL is making her withdraw large amounts of cash from her bank account. Not 100% sure but pretty sure
I can't be confrontational about it. What can I do? Stand back and watch?

Your husband needs to be the one who deals with you. You need to stay out of it.

She wont set up a POA this week, took many months for my mothers lasting POA to be set up, solicitors visits, forms, court registration etc. Although she can set the ball rolling.

I think its up to your DH to gently coax your mum to confirm what is happening with her finances and whether she is happy with the way things are.