The twin deities of Cathal and Erik are the children of Queen Mab. They are not widely worshiped by Halflings, but there are some societies which still hold their feast which spans nine days <MAY 10TH THROUGH MAY 18TH>. Both gods are depicted as having pale, pinkish skin with blue eyes and tight red curly hair.
Together the Medbson Twins represent the concept of life, death, and rebirth.
Cathal is a Halfling deity of hard truths (Death and Knowledge - LN)
Erik is a Halfling deity of practical jokes (Life and Trickery - CG)