st: Survey data: how to assign mother's age to child?

[Friedrich Huebler <huebler@rocketmail.com>]

I work with household survey data and am looking for a way to assign
the mother's age to her children. The problem is that some
observations are missing. Take the data below:

hh    id     sex   age       mid       fid
1     1     1    30         .         .
1     2     2    30         .         .
1     3     1     5         2         1
2     1     1    30         .         .
2     3     2     5         2         1


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