When to put in offer?

[AndAfter]

DH and I went to view a property a couple of days ago which we absolutely loved and want to make an offer on.
We are first time buyers (currently renting), but would be funding the purchase from an inheritance (I sadly lost my mum earlier this year), savings and a small mortgage.
My mum's property has been sold subject to contract but we obviously aren't 100% sure how long everything will take in terms of completion and the estate being settled afterwards.
If you were us would you put in an offer now or wait (until contracts signed maybe? or until estate is closer to being settled?)
The vendors are aware of the situation. We just don't want to mess anyone about if we lose the buyers for mum's house etc.
Thanks in advance! (We have never made an offer before so have no real feel for it except for watching too much Phil and Kirstie!)

I'd put the offer in now (well probably after the Christmas break now) and just be honest with the vendors as to the situation (which it sounds like you have been already). x

Put the offer in now. most buyers have a house to sell, which is an unknown time frame too. Be rubbish if you waited and they accepted an offer from someone in a similar situation. If they want a quick move they won't accept the offer.

Thanks! I will chat to DH - I think we are both a bit skittish as the we lost the first buyer for mum's house and had to remarket it (their buyer pulled out so the chain fell apart)