My question involves a child custody case from the State of: Texas

I have a 8 year old son, he is now living with grandma and step grandpa.
His mom moved out to Georgia about 2 years ago. She only calls maybe 1 a month.
I would like to get full custody of my son. How hard would it be since his mom don't care for him. now she's pregnant about to have
her second child with no job or money. The grandparents only let me see my son every other weekend.