Free child in triple room

[e-isodos]

Hi,
I am wondering if there is a solution for the following problem:
The hotel which I am working on accepts 1 free child in a triple room.
So we make a triple room which has a person cost. In this case 2 adults and 1 child (child is 100% off) it works perfect. Also if only two adults select this room they will pay as double, it is OK too.
BUT if one adult select this room the cost is under the single room that the hotel sells (Single room is 30 but person cost in the triple room is 25 euros)
What are your suggestions?
If there is a way to add a minimum for this room, which would be 2 persons or even 3 persons, the problem will be solved.
 Or even change all the rooms to be minimum and maximum persons equal. Double maximum 2 minimum 2. Single min 1 max 1 and triple min 3 max 3.
Thank you

[e-isodos]

Any suggestions??

[regi168]

May be you can think about your pricing policy

In my private opinion, it's a little strange that price of single room higher than tripe room for one person.