Page Plus and Total Wireless are both owned by Tracfone/America Movil/Carlos Slim. The customer service quality is going to be about the same as what you're currently getting to worse. They both activate Verizon CDMA and LTE devices, but data restriction policies are different between the brands, so check the fine print.
AT&T and T-Mo MVNOs are cheaper than their Verizon alternatives, but data's pretty expensive everywhere, and 1GB is going to be pretty standard at the $30 "unlimited talk and text" price point, unless you're going with bucket style plans like from Ting, Consumer Cellular, or US Mobile, and how much resource pooling you do and how much is used collectively with family plans. As such, price those out... especially if you're looking at replacing your wife's phone soon. Switching to Ting or Consumer Cellular for you both might give you some combined savings in addition to more data to work with. For example, Consumer Cellular can do 1000 minutes, unlimited SMS messages and 3GB of data for two lines for $60 plus tax per month, and you can work that lower if you use less data or minutes. Not as "much" as what Total Wireless is promising for the money, but the customer support and billing is considerably better and you could potentially get that bill lower.
Your current Verizon Moto X should already be capable of being taken to and AT&T or T-Mobile provider. However, the only LTE data band supported outside of Verizon's 750MHz Band 13 is 1700MHz Band 4, which only T-Mobile uses in select areas. Using AT&T will limit you to 3G HSPA+ service, which is pretty comprehensive and speedy, so you really won't lose much... however, many people have needless hangups about having access to LTE network coverage.
You remembered correctly on the whole GV thing with your parents. I advised against it to keep their setup simple. There's active datamining and privacy issues to consider as well as occasional call quality and reliability issues along with MMS quirkiness, but if it's for you specifically and you're tolerant of the mess... I'm not going to try to stop you, and it could potentially reduce your actual mobile usage numbers on the talk and SMS end.
Any other questions, just ask.