Here are some definitions regarding "cults" and "brainwashing"
See the following links:
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www.culteducation.com]
[
www.culteducation.com]
[
www.culteducation.com]
Not all "cults" are bad, some are essentially benign.
Some relationships have been called "cult-like" or "cultic."
Lifton offers eight criteria to determine if a thought reform program is ongoing. He says if six of the eight criteria are evident, this is sufficient to sustain a thought reform program.
These criteria would also apply to determine if a relationship might be "cultic" and controlling.
Beliefs are not the issue, but rather behavioral dynamics.