Hi all

My wife and I travel together on the train each morning and both use ipads.
My ipad has a 4G 10G Amaysim card but my wifes does not
My iphone has a data plan but only 1.5 G, which I hardly use at all
I want my wife to use my data via tethering to browse on the train as I dont use it but my monthly data allowance will not cover both of us if we both tether.
I therefore only want to tether her appliance but keep mine on the 4G.
Despite this my ipad always seem to tether as well which I dont want as if we both tether my data allowance is exceeded at the end of the month.
How can I tether hers only and not mine?

Thanks for your help