Hi My Name Is Brenda I Have A 7 Year

Hi my name is Brenda I have a 7 year old grandson who can hold or go to the restroom at school but when he gets home we have him go to the restroom and he goes in and says he tried but couldn't, go then 5 minutes later he pees his pants. It is on going the rest of the day. He does wear a diaper to bed. I don't know if it's
A medical condition or is he being lazy. I told my daughter to have him wear a diaper when he gets home from school She thinks it's just enabling him. Iam at my wits end. He does have great separation anxiety. Example when I go to put out the trash he wants to go with me. What to do?