If

'M Ω R' means 'M is the sister of the husband of R',

'M © R' means 'M is the son of R',

'M ¥ R' means 'M is the brother of R',

'M = R' means 'M is the daughter-in-law of R',

how is A related to E in the following expression?

A ¥ B Ω C = D © E