Long story short, I'm OW Sapphire, and my no-status parents are flying on WT+ in coming weeks without me. Of course they can't do advance seat reservation. But out of curiosity, I inputted my OW (non BA) membership number under my father's booking in the hopes of being able to select the seat. (Thinking it would probably reject - no harm done).
To my surprise, the system accepted my FFP number for my father's name. We have exact same last name, and first 4 character of his first name is same as first character of my name. ie.
His First Name: yyyyb
My First Name: yyyyaaaa
where 'y' is same characters
And further to my surprise, @:-) I can now do advance seat reservation for them also, taking advantage of my status.
Now, question:
1) Is this known bug, issue, problem? Does the computer just takes any FFP number to booking? I strongly suppose not. Then, is it that they just checked my Surname and First initials?
2) I intend to remove my FFP from the booking after seat reservation is made. --> will this remove their seat assignment.
3) and million dollar question: If I leave my number in this booking, will I get the points for the flight?

ok I'm treading a fine thin ice here, I know my T&C so don't get me started on fraud etc..., I am merey curious about this system.... Who's going to verify (at check-in? ticketing agent?) that this FFP# matches the pax name, if it's already entered in the first place? I will certainly remove this, as my own FFP is far more important than some miles....