Family Plan unsed Data transfer option

I would like to see Lebara offer the facility to enable transfer of unused or part of a data plan within a family group.
I quite often have unused MB's of my data plan at the end of my monthly period but my children could use if I was able to transfer some or all of what is remaining to them.
If this facility was available I am sure it would benefit Lebara as it would generate a lot of interest and appeal to a lot of families.