Getting rid of junk vehicles in Houston area?

My dad died recently and on his property are several very old (60s/70s I believe) and very junky vehicles. I cannot find any paperwork on them. I’ve tried searching online how to get rid of them but I’m being told I need the title and registration or for the owner to sign something to give permission? Obviously not possible. Several cars are the same model I believe which he used to rebuild a Plymouth GTX (the only car I know the name of). There’s also an old truck and RV. I believe they’re all missing necessary components to actually work and large portions have rusted off, tires sunk into the ground of 3 of them. Any place in the Houston area that will tow these off the property?