Simon Crosby Jr. was born on 6 Aug 1637 in Cambridge, Middlesex Co., Massachusetts. He died on 22 Jan 1725/26 in Billerica, Middlesex Co., Massachusetts. He was also known as Simon Crossbee. He was married to Rachel Brackett on 15 Jul 1659 in Braintree, Norfolk Co., Massachusetts by Major Autherton of Dorchester.

Rachel Brackett was born on 3 Nov 1639 in Boston, Suffolk Co., Massachusetts. She died after 1726.Children were:

i. Rachel Crosby was born on 20 Aug 1660 in Cambridge, Middlesex Co., Massachusetts. She died on 24 Sep 1721 in Billerica, Middlesex Co., Massachusetts. She was married to Ephraim Kidder on 1 Aug 1685 in Billerica, Middlesex Co., Massachusetts.
ii. Simon Crosby III was born in 1663 in Cambridge, Middlesex Co., Massachusetts. He died on 2 Feb 1771 in Billerica, Middlesex Co., Massachusetts. This is an incorrect death date for this Simon. He would have been 108 if this were true. It is actually the death date of his son who was born in 1689 and died on this date age 81 or 82. Since it is given in the documentation, I'm leaving it as noted.
iii. Thomas Crosby was born on 10 Mar 1665/66 in Billerica, Middlesex Co., Massachusetts. He died before 28 Oct 1737.
iv. Joseph Crosby was born on 5 Jul 1669 in Billerica, Middlesex Co., Massachusetts. He died before 1761.
v. Hannah Crosby.
vi. Nathan Crosby was born on 9 Feb 1674/75 in Billerica, Middlesex Co., Massachusetts. He died on 11 Apr 1749 in Billerica, Middlesex Co., Massachusetts.
vii. Josiah Crosby was born on 11 Nov 1677 in Billerica, Middlesex Co., Massachusetts. He died on 7 Oct 1745 in Billerica, Middlesex Co., Massachusetts.
viii. Mary Crosby.
ix. Sarah Crosby was born on 27 Jul 1684 in Billerica, Middlesex Co., Massachusetts. She died in 1734.