Since the Catholics believe that Peter was the first pope - scriptures teach us that Peter WAS married. His mother-in-law is referenced in Matthew 8:14, 15:
Jesus Heals at Peter’s House
14And when Jesus was come into Peter’s house, he saw his wife’s mother laid, and sick of a fever. 15And he touched her hand, and the fever left her: and she arose, and ministered to them. 16When the even was come, they brought to him many that were possessed with devils: and he cast out the spirits with his word, and healed all that were sick:
Scripture teaches us that Peter was married at one time. Scripture makes no mention of his wife. If you think you've got a smoking gun there, which you don't, ponder the following exchange between Peter and Christ:
"Then Peter answering, said to Him: Behold we have left all things, and have followed Thee: what therefore shall we have? And Jesus said to them: Amen, I say to you, that you, who have followed Me, in the regeneration, when the Son of man shall sit on the seat of His majesty, you also shall sit on twelve seats judging the twelve tribes of Israel. And every one that hath left house, or brethren, or sisters, or father, or mother, or wife, or children, or lands for My name's sake, shall receive an hundredfold, and shall possess life everlasting. And many that are first, shall be last: and the last shall be first." Matthew 19:27-30
"Then Peter said: Behold, we have left all things, and have followed Thee. Who said to them: Amen, I say to you, there is no man that hath left house, or parents, or brethren, or wife, or children, for the kingdom of God's sake, Who shall not receive much more in this present time, and in the world to come life everlasting." Luke 18:28-30