Cloud Families

On my MTB trip with my son G and our friends R and J we were riding on the heath near Hilversum.
It was clouded, wet and grey. But when we came to a more open spot on the heath, the sky opened and I saw these cloud formations.

The high level clouds are cirrus clouds, made of ice crystals. I think it is the fibratus.
The medium level clouds are Cumulonimbus, with a vertical cloud development to the high level. Te type is calvus.
The low level clouds on the left are Nimbostratus, causing the rain. This one is the pannus.

But we were lucky. We came back to our starting point just before the rain kicked in.