Millian

"I have sworn to Elisabeth and my brother. It is my duty and pride to keep Lillian safe from harm"

- Michael to Kaiaphas

The relationship between the Angel Michael Bane and Witch/Angel Hybrid Lillian-Rose Bane'''. Michael is Lillian's Maternal uncle on her mother's ''' side of the family. He is her protector, and has sworn to Magnus  and Elisabeth to protect her and care for her no matter what. All he wanted was, his Downworlder and Angelic family to be made whole once again. That is possible with his second-born niece.

Throughout The Bane Diaries
Michael was very committed to protecting Elisabeth and by default Lillian, as well. From the very first episode, he has been excepting Lillian, even when she was in her mothers womb.

Dahlia, the babies Great-Grandmother spotted Magnus, Michael and Elisabeth walking in the streets. She sensed a connection between Magnus's brother Michael. Dahlia revealed that Elisabeth was pregnant with Magnus' baby. "It's impossible! Michael Explains. Dahlia then convinces Michael that it is possible, and he soon takes Elisabeth under her wing. Elisabeth herself couldn't understand how she became impregnated with one of Magnus' children again.The only reason why she was pregnant the last time with Michael's 10 year old niece Zoe because Magnus had given up his Immortality. Somehow, Magnus got it back. Michael and Magnus showed Elisabeth their past. Michael was to have children, but his children were killed by Dahlia. Lillian very much looks like Michael's first born daughter Isabella. Isabella was killed along with Michael's 3 month year old son, Colton. Dahlia then cursed all Bane-First borns, leaving Magnus's daughter Zoe with a cursed mark.