Concerning Alice, check out a posting here by Rich Houghton titled "Re: Seabrook 1563 UK posted 9 January 2001. It lists her and her 8 siblings.
My wife is descended from Alice or Sarah Seabrook, Mary's sisters. Such sloppy work is very frustrating; it forces me to redo the search to find out which sister it really was. Just today I find people born in Ipswich, Massachusetts in 1548, and others who died in Stratford, CT in 1563. I wonder if they went to Plymouth from Ipswich to welcome the Pilgrims. According to some LDS listings my original ancestor here married a woman in England one day and a woman in Norwalk, CT the next day. Very early SST passenger. Not to mention a Sherwood who married her grandfather when she was 3 years old.