Can I file a motion to dismiss or vacate the judgment on the ground that lack of proper service?

Depending on the exact facts you will likely file a motion for new trial. If there is any significant risk here for you then you should consult...

How can I get my child’s father served w child support papers?

I'd recommend that you go consult with an attorney and get an opinion on all of this.

Can I have property that I inherited from my dad transferred into my name if I owe back taxes on said property?

If the property was sold at a tax sale then you (should) have 180 days to redeem it. You might want to consult with a title co/ real estate...

Do I need to hire a lawyer?

1) The kids' preference is just a part of what the court will look at 2) You would likely be found in contempt of a court order if you do not...

What can I do to get my daughter back?

If there are no court orders in place then either parent may take the child. If the child has been with you for a significant amount of time then...

Am I required as a residential tenant to sign an acknowledgement of an Assignment of Lease due to a sale of the property?

On these facts you are not required to sign anything and there is nothing the LL can do about it. A sale should not affect your rights as a tenant.

Can a written provision in the contract replace the absence of insurance coverage on the part of the contractor?

You can write it in but he can still sue you in case of accident. And if he has a fatal accident his survivors will certainly sue you. Probably...

Your sister should call a Criminal Defense attorney where the ticket was issued.

I have health and safety violations at my apartment. Can i withhold rent?

You can be evicted if you don't pay rent. Start here: https://www.texastenant.org/

That's up to the Court's discretion. Talk to a local attorney about what your local judge might think. A few minutes every few days is probably...