I am sorry that I have not been able to substantiate more, but pre-1933 is difficult to find information, and later is expensive.
Any dates are definite.
We think that Ellen had a twin, also called Betsy who died but we cannot clarify that at the moment. Polly married, gave birth and died in a month. I can remember these two who lived to be very old and outlived my grandfather. I have not researched them yet. Richard the younger also had many illegitimate children.