I am just trying to learn and better my life and hopefully learn something I can pass along to help my children out.  

Our upstairs tenant put some holes in the wall when moving some furniture and we are trying to figure out how to handle repairs.

Whoops sorry I should have stated it is FEDERAL LAW which includes Texas.Review below:The Fair Housing Act prohibits discrimination in housing on the basis of: Race or colorNational originReligionSexFamilial status (families with children)DisabilityUnder the Fair Housing Act, the following activities are illegal: Refuse to rent or sell housingRefuse to negotiate for housingMake housing unavailableSet different terms, conditions, or privileges for sale or rentalProvide different housing services or facilitiesFalsely deny that housing is available for inspection, sale or rentalFor profit, persuade owners to sell or rent (blockbusting)Deny any access to or membership in a facility or service (such as a multiple listing service) related to the sale of housingRefuse to make reasonable accommodations in rules or services if necessary for a disabled person to use the housingRefuse to allow a disabled person to make reasonable accommodations to his/her dwellingThreaten or interfere with anyone making a fair housing complaintRefuse to provide municipal services, property insurance or hazard insurance for dwellings, or providing such services or insurance differentlyThis Federal Law. 

You mention having a "family" which I suppose means child(ren), so they are top priority in my book.

"Several important factors boosting rental demand include later marriage age, increased single-headed households, longer delay in having children, millennial and baby boom lifestyle shifts toward urban living.

., it's typically not included, but on the off chance that you're providing furniture or anything else for the tenants, it's easy to add personal property coverage, as well.

If the tenants wants to stay since they love the location and there are no young children what do I do?

Q2: My father wants to add his children (myself included) onto the house deeds.

Prior to becoming an agent, I had a successful career as a Special Ed teacher working with children with Autism at the New England Center for Children in Southborough, Massachusetts. 

It's a common misunderstanding to view the prohibited transaction rules as a set of clearly defined guidelines precluding transacting with specified disqualified persons - yourself, spouse, parents, children, spouses of children, etc.