Like father like son.
Sheldon(son)and Shane(father) our grandson and our son-in-law.
No problem home servicing both machines. Actually Shane home-made his first motorbike.
To add to the mix Sheldon's mother, our daughter Beverly, bought a brand new 500cc motorbike for transport to her first job, back in the late seventies. Of course I too had my turn earlier when I landed way up country in my first permanent teaching position.
Wondering who has and who has not had their own motorbike at some time.
NotBob
Pro 
I never had a motorbike, but when I was at college I wanted on of these:
Kawasaki KX125