Hi I am a grandma my daughter left her son with her son's her ex mother in law but she don't let me see my grandson so what can I do to keep him or see him on the weekends??

Some States allow Grandparent visitation but you have to go to Court and request it.

Where are you?

I live in Winneka, Ca. My grandson lives in Los Angeles, Ca.

Section 3102 of CHAPTER 5. VISITATION RIGHTS - Sections 3100-3105 - California Family Code - California Code :: Justia

You absolutely can go to court and have visitation ordered. I would recommend contacting a local family law lawyer and beginning the process of visitation.