Can my son's grandparents get full custody of my son just because they think my new husband has anger issues?

Question Details: I have a 3 year old son from a previous relationship. We were never married. He has been staying with his father's parents for 14 months now. They would not allow him to stay overnight with me because they did not like my current husband. I have been married to him almost 2 years now and we have a 18 month old son together. Just recently I found out that since our custody papers say I have him Sunday through Thursday they couldn't stop me from getting him, so when I decided to go get him they filed for full custody and are taking me to court within the next 2 weeks for it. Will the courts take him away from his little brother?

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