I was so excited to see your message. Robert Alway is my 3rd great grandfather. He was baptised in Almondsbury. In addition to the children you listed, there were 3 older daughters - Diana, Ann, and Mary. Diana is my 2nd great grandmother. I was able to find some information about Thomas Smith Alway but have had no luck at all with respect to the other family members. I hadn't realized that so many of them had emigrated to Victoria.
I have traced the Alway family back to about 1515 and would be happy to share my information with you.