Bringing cycle from India

Hello,
We are living here on E pass. My parents who are coming here for visit on this Apr , wish to bring a cycle(tricycle) for my 2 yr old boy. Is there any procedures/ duty payment to bring it here? do they have to declare it in the immigration? will they have to face any problem if they carry it with the luggage? is there is any thing such, please guide.

If it is a personal gift, there will be no issues and they do not need to declare or pay import fees.

any problem with metal body? and it will be dismantled aslo

Why should that be a problem?
They cannot bring it in carry-on luggage, of course, due to security rules.

ok thank you

Should not have an issue at Singapore Nor at Indian airport, as you said tricycle would be dismantled.