Hello, Maverick It doesn't sound right. Is that the original sentence? I guess his mother doesn't like B because B is always eating the mother out of house and home.
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'He told me, [or did something that was] as good as [telling me].' =>
'He told me, as good as.' =>
'He (as good as) told me.' =>
'He as good as told me.'
Good here = effective.
In other words, I would take 'as good as' as the adverbial remnant of a longer phrase.