Lens selection for Olympus OMD em 5 / 20mm vs 25mm

Hi

I am looking for a prime lens to the additions I have and sort of between 2 lenses.

i have:

12-50 kit lens

zuiko 45mm 1.8

pana 45-200

now I am between Panasonic 20mm 1.7 or  PanaLeica 25mm 1.4

since I own a 45 is it worth buying the 25mm or would I be better of with the 20mm?

any suggestions?

I do pics of my kid, and like street photography. And sort of new to photography

thanks