My parents have a tendency to miscommunicate with each other, get angry about the miscommunication, and drag family members into their fights. I want to get a crystal(s) to put in their house to help to moderate the negative energy, but I'm not sure what would be a suitable option. Can you make a suggestion?
I am so sorry to hear your parents have been having some problems. Black Tourmaline is an excellent stone for ridding a house of negative energies. Try placing several pieces around the house or gridding the rooms with it. Jet is another protective stone that draws out negative energies. Smokey Quartz can do this too and also brings in positive energy to replace the negative. Another crystals to consider using is Rose Quartz, which can gently bring in love, peace and calming energies and helps reduce anger and over-sensitvity. Jade and Rhodonite are other crystals that promote balance and harmony. Also, please remember to clear the crystals often to recharge them and increase effectiveness. Here is an article with more information on clearing crystals. Because you (and the others in the house) are being directly affected by the negativity, it would be beneficial to carry crystals in your pocket or to wear them for additional protection. I hope this information helps with your problem.
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Disclaimer: I must share the standard disclaimer that I am not a doctor and cannot give out medical advice. Crystals for healing should be used as a compliment to other therapies and not as a replacement for regular medical care.