I Maccabees 16:12

12 For he was the high priest's son in law.

I Maccabees 16:12 In-Context

10 So they fled even unto the towers in the fields of Azotus; wherefore he burned it with fire: so that there were slain of them about two thousand men. Afterward he returned into the land of Judea in peace.
11 Moreover in the plain of Jericho was Ptolemeus the son of Abubus made captain, and he had abundance of silver and gold:
12 For he was the high priest's son in law.
13 Wherefore his heart being lifted up, he thought to get the country to himself, and thereupon consulted deceitfully against Simon and his sons to destroy them.
14 Now Simon was visiting the cities that were in the country, and taking care for the good ordering of them; at which time he came down himself to Jericho with his sons, Mattathias and Judas, in the hundred threescore and seventeenth year, in the eleventh month, called Sabat:

The Brenton translation of the Septuagint is in the public domain.