The only thing I see that may be called into question (since you live with your parents, even though you pay rent to them) is if you pay more than half the cost of keeping up a home.
If your son was a full time student for any one semester in 2020 and meets all the other qualifications under the "qualifying child" rules,
********OR*******
If he was not a full time student for any one semester that started in 2020 and qualifies as your dependent under the "Qualifying Relative" rules
***THEN***
You can file HOH.
