Soution to the nephew thing
I think I have come up with a possible solution for Clay Macgyver to be Mac's nephew
Clay and Angus aren't really related imagine this Angus Grew up with these 2 people in minosta John and Jane Smith well lets say they have a kid Clay so when Clay is 3 the parents go out and get into a cra crash and die Clay has no noe so Angus Adopts him (hence the last name change) as Clay grows up he knows the truth so Angus isn't his father more like an uncle (it happens in real life friends of the family beng called uncle or aunt). so thish ow Angus become and uncle and Clay Become Macgyver
a possible solution one that even the producers might of chosen but we shall never know