Can a revocable trust be amended by the grantor and be considered legal if not notarized or witnessed?

Question Details:

My brother and myself were to be beneficiaries of my father's assets. Amendment says that his 4 grown children, my brother and I are now equal beneficiaries. I had no knowledge of this until after my father passed away; my brother and his kids knew all about it. Does real property (my father's home and sale of it) if split 3 ways per amendment need to be notarized as amendment since it is real property. It is all very suspect to me. My brother is acting very cavalier about it. Is this legal?

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