#grimmcest

Jacob and Wilhelm were excluded from the school's social life -- which drove them to pursue their studies more energetically.

...

In 1825 Wilhelm married Henriette Wild, whose family had supplied the Grimm brothers with some of the best stories for their folk tale collection. Jacob never married, but apparently lived happily with the new couple -- one scholar noted that the brothers "both live[d] in the same house, and in such harmony and community that one might almost imagine the children were common property."

...

The two brothers continued working together for the rest of their lives. When Wilhelm died in 1859, ... Jacob, deeply saddened by his brother's death, became more withdrawn until his death in 1863.

Source {Christian Science Monitor} 

OOOOO, that's enough "proof" for me!

Max: You're perfect for each other. You're like Hansel & Gretel!

Caroline: They were brother and sister!