For greedy people, you must suppress them immediately, or they will become insatiable. The Spears couple were never satisfied, especially when the IT bubble burst, the regret of not selling Cisco's stock in time tormented them for a long time, otherwise, they wouldn't promote their second daughter so vigorously.
At the same time, they've gained quite a bit from Britney, even though Adrian had originally stated that Britney must cut ties with them, realistically that's impossible as she is always their daughter, and they haven't shown much disregard for money at all costs. So as long as the Spears couple don't overstep, Adrian turns a blind eye, and indeed they are quite cautious; even if their demeanor over Jamie's issue was unseemly, they mostly believed they wouldn't benefit if left to Adrian, thus he talks with them.
