# libtmux::FilterExpr::RelationTest::child

- **Module:** libtmux::FilterExpr::RelationTest
- **Package:** libtmux-cxx
- **Language:** C++
- **Kind:** attribute
- **Source:** https://github.com/libtmux/libtmux-cxx/blob/85e8bd603a322dc32bb8b9aeb1a72bcf36945f1d/include/libtmux/filter_expr.hpp#L102
- **Page:** https://libtmux.org/reference/cxx/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.