Betrothals are not uncommon in this time period, especially among the wizarding world, where bloodlines are often adamantly kept pure. So, the betrothal of young children is a common practice. Here, all current betrothals are listed.
If you want to propose a betrothal between two characters, either comment it here or ask the RPer of the other student. Please specify whether the betrothal has been confirmed or not. If it hasn't, just post the pairing, so the idea can be considered.