@Ram Maharjan, first - research TX landlord / tenant law so that you know how to properly handle notice requirements to proceed on to eviction. I'm in NC, and here we must provide a 10-day notice (demand to pay or vacate) as early as the 6th, which is the day we can post a 5% late fee, as the 1st through 5th is the payment grace period. I ALWAYS post a late fee and send the demand notice on the 6th, so that I can file for eviction by the 17th. Knowing this, it is exceedingly rare that my tenants have not all paid by the 5th, and for the few that are late each month, they always pay by the 16th. If they know you are professional and serious, you magically avoid most problems.
Second - what does your lease say on such matters as late rent? For example, my lease says that repeated late rent payments will likely result in lease non-renewal. But that if renewal is offered, it will be at an additional 5% rent increase beyond whatever would have been the increase amount anyway. I figure if they're okay paying a 5% late fee each month, then I should make that the new base rent + the normal annual renewal increase. I cover this in detail with the tenant going in, explaining that I do not want their late fee - I just want on-time rent payment.
Lastly, might your former co-work have any influence on their daughter here? If not, follow the TX process to get to an eviction ASAP.