The McPoyles are a family that commonly have members who enjoy abusing others. The whole living lineage seems to dislike "The Gang" as do the "Cool Kids". Multiple members have been arrested or gotten into trouble for sexual abuse and things similar. Their parents are probably criminals.
Margaret McPoyle - She had sex with many men.
Liam McPhoyle - He told everyone along with Ryan that they were both abused by the Coach. He has even tried to take over the world.