You may say 'omedetou.'
omedetou
On your grandchild's what? Be specific to get specific answers. Anyways that would be:'Mago-san no koto omedetou gozaimasu'.
Felicitaciones por su compromiso.
we say Nakagawa if we want to say inside in Japanese.
To say tennis in Japanese.........テニス
congratulations on.
omedetou
No, you cannot say, they send their congratulations. You have to say they sent their congratulations.
no flowers say congratulations
In Māori, you can say "whakamihi" which means congratulations.
You can say "čestitke" in Bosnian to say congratulations.
In Hindi, you can say congratulations by saying "बधाई हो" (Badhai ho).
congratulations on your wedding
congratulations on your achievment
When someone says congratulations to you, or when someone congratulates you, say, "Thank you".
In Hawaiian, you can say "Ho'omaika'i."
You can say "Congratulations on your new nephew!" or "Congratulations on becoming an uncle!" to express your joy and excitement for the new addition to the family.