Mother died in CA only asset is land in TX can we probate in TX?

Yes, if mother's individual name (not a living trust) is on the deed to the land, then you will need to have an ancillary probate in Texas,...

If im executor of will and medical Poa over my sister and her daughter was granted temp guardian does her will still stand

A Guardianship trumps any Powers of Attorney (financial and medical) but not the Will.

My brother has cancer. He has debts and a fiance (pregnant). What happens to his assets (house-worth 200k) once he dies?

His house passes in accordance with his Will, if any, and if none, then in accord with what the State of Texas provides via the Texas Estates Code...

Sub: Drafting agreement for a LLC Company ownership share

You need a consultation with an attorney who has done hundreds of LLCs and has years of experience with such.

The basic documents in addition to a Will would be the following: Financial Power of Attorney Medical Power of Attorney Directive to...