be in each other's pockets
US /bi ɪn iːtʃ ˈʌðərz ˈpɑːkɪts/
UK /bi ɪn iːtʃ ˈʌðərz ˈpɑːkɪts/
1.
to be very close and spend a lot of time together, often to the point of being too dependent or involved in each other's lives
:
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Those two sisters are always in each other's pockets; they do everything together.
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It's good to be close, but they seem to be a bit too much in each other's pockets.