Things grew dark and serious on Sister Wives Season 4 Episode 16.

And it was all because of three-year old Truely, who was rushed to the hospital after her doctor told Christine just how dire it can be when a child goes cross-eyed.

This emergency put a damper on Mariah's farewell party, as that event became far less important after physicians determined Truely was in need of dialysis.

These were legitimately scary times for the Browns, but the little girl did pull through in the end and the family even learned a valuable lesson about spending time with loved ones. You really can't ever do it enough.

Watch Sister Wives online to relive an unusual, frightening episode now: