You really, really, really need an attorney. There are numerous complications here and specific wording of the trust and specific state laws are implicated. This is not going to be a thing that slowly disappears into the maw of time. Someone is going to look at things at some point and they will look to you to make good if there is a problem. There are potential criminal issues here if you exceed your powers or use them incorrectly. Even if it is a fairly innocent mistake.
Some issues:
1. The elephant in the room is mom's incapacity. While you have a POA, that may not give you right to be the trustee of mom's trust. (Or the "family" trust either, if mom is the trustee and you the successor.), let alone the revocable trust that is funding them. Usually, in such a trust situation, the spouse is a co-trustee and is the sole trustee of the marital and survivor trusts (We'll just say A and B to not get caught up in nomenclature.) until death or is otherwise incapacitated. Now, you may need an attorney to help document the trusts' requirements for incapacity for mom so you can take over as trustee of the current trust and of the A/B trusts that will be funded.
2. Funding is another issue. Most living trusts can be a little fuzzy on the funding of the A/B trusts to give the surviving spouse the ability to manipulate things a little to best take advantage of tax and other issues. The problem here is that mom cannot make the choice as she is incapacitated. You will probably have to make the choice and the choice can benefit you and hurt mom's care if you are not careful. Other beneficiaries (if any) will care as will the state both for medicaid purposes and for elder abuse purposes.
3. Eldercare planning is related to 2. While you have some risk depending on how you act in funding; mom also has risk in assuring she gets the best care and quality of life in her remaining years. How the funding takes place can affect that while still giving the largest amount to pass through as possible.
Now is the time to step very carefully. Even in a fairly small estate, every choice here is ripe with risk. Don't play this one blind.