Walter William Denney (Denny) - Some Issues that need resolved

Consistency Check:
Margery Margret Denny is under 12 years old for the birth of her child James Denny.
Margery Denny is under 12 years old for the birth of her child Ann McCuiston.
Margery Denny is under 12 years old for the birth of her child Margaret Denny.

There is really only one issue and that is "Was she under 12 when she had her children?"