What to do!?

We just found out we're pregnant with our first after a year of being married!!! I can't wait to tell my mom! My husband wants to wait until we have time to tell his parents the next day... The problem is we just found out his parents are getting divorced, after 30 years! They aren't getting along, not living together, and not talking... Do we try to tell them together? Or separately? We both aren't sure what's the right way! Thoughts?