The CPS follows households, not people. Extrapolating on your example, if occupants (family A) move out of a household in the 8 months between MISH4 and MISH 5, and new occupants (family B) move in, the household will remain in the CPS, but will report on family A for the first four months (MISH 1-4) and family B for the second four months (MISH 5-8). IPUMS CPS has constructed a number of weights for leveraging the panel component of the CPS: LNKFM1MWT, LNKFW1YWT, LNKFW8WT, LNKFWMIS14WT, and LNKFWMIS58WT. More information is available about linking from our 2018 workshop on leveraging the panel component of the CPS; you may find the presentation on weights of particular interest.