These are the names that I can see:
Wife Anne
Daughter ? ELizabeth, but he refers to her as his child, not daughter
Brothers Simon & Thomas
Brother John Newman, executor
Mother - no name given
Sister Jane?, but I think it is supposed to be a surname.
Sister Emlyn? (this might be a variant of Hamlyn?)
Sister Hammond (no forename given, but might be worth looking at Philippa Newman who m William Hammond in 1614)
Sister Stonestreet (appears to be Elizabeth Stonestreet nee Newman, m Nicholas Stonestreet in 1624
I'm afraid I don't see Margaret there at all.
Nell