# libtmux::FilterExpr::RelationTest::child

- **Module:** libtmux::FilterExpr::RelationTest
- **Package:** libtmux-cxx
- **Language:** C++
- **Kind:** attribute
- **Source:** https://github.com/libtmux/libtmux-cxx/blob/393d4b0ad666f18a6581f1eb281741a75a7503f0/include/libtmux/filter_expr.hpp#L102
- **Page:** https://libtmux.org/en/cxx/latest/reference/libtmux-filterexpr-relationtest-child/

The child compares another entity, so it cannot live in this variant.

Its lowered form can, which is what keeps a relation translatable.