Can I be in trouble with all this and the quads that were taken be brought back.

Complex question involving elements of elder abuse, elder law, undue influence. Yes. You need to speak to elder law counsel immediately.

How can we protect his assets (owns 1 home-paid off, Roth IRA- $25,000), if we decide to apply for Medical and he qualifies.

Based on information provided, you have several options. Some observations; Residence exempt for purposes of applying for Medi-Cal. Medi-Cal may...

If my husband predeceases me, will I need to give his family notice of the trust? i.e. are they entitled to notice as heirs?

Maybe. Notice requirements governed by terms of trust and CA probate code. All beneficiaries of trust entitled to notice. Heirs not entitled to...

Can I buy the house from him and legally own it so that it is no longer part of his estate?

Yes. You may buy house from father. Several viable options to arrange necessary financing options, including, not limited to: -dad carry new...

What are my mothers options

Not clear why bank froze accounts. Well drafted POAF should allow mother to transfer accounts. Depending on dementia stage, aunt may be capable...

Fees vary. Depend on amount of work required. Consult probate counsel.

Maybe. You may/not have inheritance rights under intestacy or other laws. Not enough information provided to opine further. Appears to be large...

Yes. You need Mexico probate counsel. If F had a probate estate in CA, you also need CA probate counsel. Immediately consult CA probate counsel...

Will this account transfer, outside of probate, at the second death of my wife and I?

Maybe. Account will transfer to surviving joint owner(s) at first death without probate. If only you and W are joint owners, entire account will...

Yes. Attorney licensed by FL state bar may practice in any FL county.