Tenant breaking lease

[Mushtaq G.]

Hi friends,  purchased my first rental in may this year, got it rented in mid June, signed a 12 month contract with tenant, about a week ago tenant sent me an 'official' email that there is a mice/rat problem, although there were cheaper options I went with professionals who were charging me 7-8x only because this is a long term investment and I wanted to get it solved, the pest professionals sealed the attic and set traps, they followed by couple of times to remove traps and refill bait boxes, my tenant now sent me lease termination letter citing health concerns due to mice/rat problem, they paid for current sept month and said that I can keep half the deposit for Oct.

What should I do here, they have three small kids so I understand the reason for concern but I am also doing my best to solve the issue, should I go ahead and accept their termination or should I fight it out, not sure if involving lawyer is good as I am trying to make some cash flow and not lose it.. please advice also I am from Texas and would love to hear about TX law on this.