take a look at the citations in Richardson's Magna Carta Ancestry
https://books.google.com/books?id=8JcbV309c5UC&lpg=PA56&ots...
Perhaps there are more recent discussions on "which" Sir Thomas Boteler, Knight and "which" Elizabeth?
And there's a profile comment:
In the Astley pedigree she is referred to as the daughter of Sir William Boteler of Warrington (d. 26 09 1415). But dates do not seem to fit; and the biographer of Sir William has been able to establish only two children.
MD
So it may come down to a matter of opinion ....
I see in the biographic notes for Sir William Boteler, of Bewsey, MP
"Sir William also left a daughter named Elizabeth, who later married the son and heir presumptive of Nicholas Boteler* of Rawcliffe, John’s colleague in the Leicester Parliament of 1426.8"
Which makes it unlikely that he was Margaret's father, as he had 1 son, 1 daughter, according to his History of Parliament biography.
Agreed that she should be disconnected from that set of parents?
Fran Whyte (Adams) Not that I know of. Disconnected from parents and locked relationships - anyone with evidence can present by discussion.