<human>: I've been in a lesbian relationship for the past 4.5 years. I will be 23 in February, my girlfriend will be 22 in September. 

Here's the dilemma, my GF and I have always wanted children and have discussed having them at length. Ideally we wanted to wait until we were around 25 and better settled into our lives. My brother is very open minded and willing to give us sperm so that my SO can carry a child that has my DNA, which would be an amazing opportunity for a lesbian couple. 

I love the idea of having a child that is genetically both of ours. He will be having his 3rd child in July and would like to get a vasectomy by the end of the year. So, I don't know whether to have children now and continue to work towards the other goals we have set for ourselves. Or not have them now and try to accomplish what we had hoped we would before having them, and give up the opportunity to have children with both our DNA. A defining time in our lives and all advice is appreciated.

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Can you summarize the given text in a few sentences?
<bot>: My brother is willing to give my SO sperm to carry a child that would have both our DNA, but would like to have a vasectomy in December. We had not planned to have children for another 2-3 years.