.. because it's too inconvenient for him.
he is taking them on holiday next week with new DP and they are getting taxi to the airport about 30 miles away.
I don't think you are legally obliged to use one in a taxi however if the journey is planned then I think you should.
Can't believe he would put DSs safety and comfort (It's horrible being in a car if you are low down) above his own inconvenience.
Following from my earlier thread about bathsit's more important to look and smell right than to be safe!!
he also wants to take their clothes tonight so he can iron them all ("we are staying in a good hotel you know").
Also despite us going over summer holiday arrangements several times he has now asked me whether I have booked the summer holiday( which I have) as it appears to be inconvenient to him and his new DP. He has agreed to look after them for the first half of the summer hols and now this seems to be inconvenient. Well its tough because I can't change and gave him several opportunities to discuss before I booked it!!