This is something I can’t understand.
especially obtaining statements going back 3 years, which is what would prove that the young person was underage when it all started.
if this person has online banking, they would have had to do the search online themselves to get the old statements and hand them over to their mum.
If they get paper statements, then we would have to asume they’re stored in a shoe box at their mum’s place and that’s how she found them.
The only other possibility I’ve thought of is that the mum and child had a joint account and that’s how the mum could access such old statements.