I used the 50mm f/1.4 lens, with the camera in aperture priority mode, and experimented a bit with the depth of field. Indoors, I put the ISO on auto, with a minimum shutter speed set at 1/60s. In hindsight, I should have fixed the ISO. The shutter speed was a little too slow in some of the shots (mostly when the children were involved!), because the camera automatically set the ISO too low.
And, I'm still getting some inconsistent results with the auto-focus... I think I need to use the centre auto-focus point more and then recompose the shots, rather than using the 18 off-centre focus points.
Despite not taking particularly many photos, so as not to be a complete pain, and some auto-focus issues, I got a few decent shots - a mixture of posed and candid ones.