His parents first let them in because they thought that they were there simply for some business proposal.
They asked about their family once inside and were eager to meet their children.
At that time, it was only Richard who was not yet around, so his parents thought that they simply liked children. So they asked the servants to let him go to the office to be introduced.
But when they were in the office, the family saw their family portrait and suddenly started talking about marriage between him and their daughter.
Before they could say anything, Richard had come, leading to what had happened when he arrived.
After that, his parents were adamant in rejecting these people.
But they are so influential to the kingdom that even the king started pressuring his family for it.
Some troubles occured and Richard watched his parents face problems after problems, he decided it is not worth it.
Society has already decided.