I did considered that option. Problem is when it turns off our home line it will not auto forward to a cell. I also would like to configure the same on my 2 cell phone GV lines but if I use GV to disable inbound calls then our cell phones will not ring either.
"forward" may be the wrong word, but GV can do what you want. Add your wife's cell phone to this GV account. Now there are two ways to handle. If you are OK with your wife's cell ringing simultaneously with house phone - just leave it checked. If, however, you want your wife's phone ring only in the evenings, set it up on the schedule that "mirrors" your house phone.
I realize that your wife's phone is
GV/Sprint -I don't know if this adds any complexity (eg., Google won't allow you to add it to a different GV account). With regular (non-GV) phones it works like a charm
The second task (disable inbound calls on my 2 cell phone GV lines) is certainly trickier... doing manually "do not disturb" every evening is certainly a pain - you may as well take the cord out of the device. The totally geeky way is to have a scheduled job (Linux cron or windows task scheduler) that would post changes in the device twice a day.