Both of you are having problems with hair regrowth after treatments, if you are getting very thin and fine hair, then have it cut like what is called and Italian cut with a razor and very short that will give it strength
for follicular oxygenation and take Biotin [H] a vitamin
for hair regrowth.
Please ask your doctors if you can take Biotin, if so then you will see it grow healthy and strong in a few months.
Good luck.