I believe Christian Poulsen (also documented in various Queensland records as Cristian Poulson) married Katherine Mary Lord (Catherine) in 1923. Other than a son Robert, I haven't been able to find records of the children you mention. Perhaps I will keep experimenting with different spelling.
I think this Catherine Lord was my husband's great aunt, the sister of his grandfather Robert Thomas Lord.
I would be interested if you have any other information about Catherine Lord, her mother, siblings or children
Thank you, Jo