If it's census
transcriptions you're looking at on Ancestry - be aware that errors in spelling and variants are common, so the information can really only be used as a guide.
Please don't base any of your research on transcriptions!
Yet again, the only source for downloading the actual images is from Scotland's People - Ancestry don't have these.
I suggest you bite the bullet and buy a batch of 30 credits on SP which will cost £7.00.
If you were to download the marriage cert, this would confirm without doubt, the spelling of Marion's surname and with the remaining credits, you could also download one or more of the children's births or one or more census image.
Anne
