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# Ignored By Parent Size
### Introduction
`Ignored By Parent Size` determines whether the parent of an instance considers the instance when performing its sizing. This value is only used if the parent has a [Height Units](/gum/gum-tool/gum-elements/general-properties/height-units.md#relative-to-children) or [Width Units](/gum/gum-tool/gum-elements/general-properties/width-units.md#relative-to-children) of `Relative To Children`. If a parent has a `Height Units` or `Width Units` of any other value, then this value has no impact on the parent's size.
Ignored By Parent Size controls whether the parent ignores the child when performing a layout
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