Yes, an OBi can be configured to do that. Use Expert mode on the portal to change the X_InboundCallRoute of the Voice Service that GV is on, probably SP1.
Use your actual numbers instead of the following placeholders:
222 222 2222 Your parents' number
333 333 3333 Your cellphone number
444 444 4444 Your wife's parents' number
555 555 5555 Your wife's cellphone number
Amend the default ph to
{(+12222222222):sp1(3333333333)},{(+14444444444):sp1(5555555555)},ph