Question 1

Do I need a Piano/Keyboard at home?

Accepted Answer

Ideally yes. The real progress comes from "little and often" practice, between sessions.
It doesn't have to be expensive. For example, the PSR-E383 is a good starter, for under £200. Or you can get older PSR models, second hand, for much less.
HINT: Have the keyboard ALWAYS set up, and (if possible) plugged in and turned on. For younger people, even having to turn it on and wait a few seconds is a barrier to micro-practice sessions

Question 2

How can I encourage my child to practice?

Accepted Answer

If your child is receptive, make a Fuss!  "That sounds nice"  "what's that you are playing there?"
Practice session don't have to be long. A few minutes each day.
Have the keyboard ALWAYS set up, and (if possible) plugged in and turned on. For younger people, even having to turn it on and wait a few seconds is a barrier to micro-practice sessions

Question 3

What is is difference between "Piano" and "Keyboards"

Accepted Answer

In theory, nothing. They all have the same layout of notes. So the music theory is the same. However:
A piano has 88 keys  - a keyboard can often have less (and be smaller)
A piano as a weighted (heavier) key action - a keyboard is often lighter to play
A keyboard can make different sounds (drums, strings, sound effects)
A keyboard is often cheaper (at the entry level)
https://www.youtube.com/watch?v=Tdtad_UQZtQ

https://www.youtube.com/watch?v=OiVFwBhpuEI

Question 4

How much do sessions cost?

Accepted Answer

Please request and info pack:
Request Info | Rock School Keys(https://www.rockschoolkeys.com/request-info)