The tree you are looking at on Ancestry may be mine.
Yes the thought had crossed me that the William son of Richard and Mary could be the father of Drusilla Brock b 1852 but he married in 1853 ( which I know means nothing) . I have DNA matches with ancestors of this William Dawe. i have been in contact with 1 match to try to ascertain if they have matches with Drusilla in them and how many cms but they have been unable to help.
I will keep chipping away at this thankyou for helping.