I really don't think minutes are your problem, but rather the data.
You say you use >10gbs per month. 6gb of data (only on phone) will cost you about $75. Tethering from each of those phones will be another $30 for each line.
This is on Verizon/AT&T. Sprint may be cheaper, but it's not going to be fast - and even if it is cheaper, it'd only be cheaper by about $20 total (Guessing here).
Stick with some good internet for your household, maybe $40 a month, and get 2-3 basic phones with unlimited calling.
You say you use >10gbs per month. 6gb of data (only on phone) will cost you about $75. Tethering from each of those phones will be another $30 for each line.
This is on Verizon/AT&T. Sprint may be cheaper, but it's not going to be fast - and even if it is cheaper, it'd only be cheaper by about $20 total (Guessing here).
Stick with some good internet for your household, maybe $40 a month, and get 2-3 basic phones with unlimited calling.