Here are some possible ways to refer to grandsons in Māori:
* "Mōkopuna tane" (pronounced mo-ko-poo-na ta-nay) literally translates to "grandchildren (male)" and is a general term that includes grandsons.
* "Tamaiti a" (pronounced ta-ma-ee-tee ah) followed by the name of the son who is the father of the grandsons, would mean "child/children of [son's name]"
* "Moa" (pronounced mo-ah) is a term used for a grandson, but is typically used in specific family contexts.
It's important to note that the most appropriate term will depend on the specific context and the relationship between the speaker and the grandsons. It's always best to ask a fluent Māori speaker for guidance on the best way to refer to grandsons in a specific situation.