Farhan Khan, who is married to Farook's sister, spoke on behalf of his family in Anaheim.
Khan said he last spoke with Farook about a week ago and said nothing seemed out of the ordinary, and that his brother in law actually seemed very happy.
Farook and Tashfeen Malik had a baby girl about six months ago and Khan said they took the child to a relative's home Wednesday morning and dropped her off.
The two had not been seen since from family.
"I am very sad, deeply sad and shocked something like this happened here in my community. I love this country, I'm living in this community for a long time and something like this happened here," Khan said.
"On behalf of my family, all of us are very shocked and very sorry for what happened," he continued.
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Khan added he had "absolutely no idea why he (Farook) would do this. I am shocked myself."