Please identify snake under my back deck. (0/1)

I know these pics are not clear nor well lit. But if anyone could
identify this snake I would be very appreciative. I live in San
Antonio Texas and this snake was on my back deck. I think it lives
under the deck and helps keep down the rodents and other varmints so I
am not really eager to get rid of the snake unless it is venomous or
could otherwise be harmful to my 4 and 2 year old grandkids.

Any help will be appreciated.

A concerned grandpa.