The premise of “That’s My Boy” is ludicrous, which is fine.
As a Somerville (wicked!) middle school kid in the 1980s, young Donny scored with his teacher and got her pregnant. She went to prison (a page right out of the 1980s Pamela Smart case) and he raised their son, solo. Actually, make that Han Solo, since that’s what this “Hot for Teacher” kid decided to name his boy. Then Donny rode his own wave of celebrity. For a while.