"Relative" includes spouse, child, parent, brother, sister, grandparent, grandchild, first cousin, uncle, aunt, niece, nephew, brother-in-law, sister-in-law, daughter-in-law, sonin-law, mother-in-law, and father-in-law, whether natural, adopted, step or foster. The term also includes same-sex or different-sex individuals who have a relationship of a romantic, intimate, committed, or dating nature.
Mich. Ct. R. 9.112