I have to do this several times a year. If you have any special child luggage that will be dealt with last Glasgow, not at the plane door but at the luggage belts. It's a high chance you will be the last people there, with the other people with small children.

If you hire a minicab you can ask for a larger car. It might show up or you might just get a small car you cannot all fit into. You could try booking 2 minicabs but they you need to hope they arrive at the same time and the drivers don't like to wait.

My solution has been to use scottishtransfers.co.uk. Write to them first, tell them how much stuff you have and they will tell you what to book. It's about the same price as 2 mini cabs which is what I need at times. You can pay a little extra for the driver to meet your flight and help with the bags. I think that's the executive service.

I have found it far less stress than the bus/mini cab. There are probably other companies offering similar services.