How to negotiate premiums for supplemental insurance?

Family, Education, Health and Pets
1

The offer for our older boy is lower than premium for the younger one, which doesn’t make sense if we are talking about dental insurance. No history of dental issues, 0 usage so far.
Is this something I can negotiate with the agent, or are their offers always final and I should just ask another provider for the offer?

Thank you

2

Do both. Ask another provider and it it’s better ask the first if they can better it.

3

https://en.comparis.ch/krankenkassen/zusatzversicherungen

4

Are you sure it is not just the discount for having more than 1 child?