Can only repeat the sentiments already said - very saddened to hear your news.
Been dealing in various bits n bobs for a few years now, and not massively surprisingly the sovereigns are the most valuable. Nice little best-kept secret is try the oldgoldshop - they're based in Coventry - but regularly give the best prices, nationally. (I have NO affiliation with them, I must just say

)
We used to sell the £5 coins for £5-6, which isn't exactly stellar, but they're collectable items, nonetheless, and legal tender, of course. Just be aware that some may be the 'crowns' which at a glance look the same, are the same dimensions and weight but often worth just 50p/£1 on ebay etc.. and can be bought wholesale for 25p each.
A lot of people get prices wrong, because they see what price something is advertised at, of such as ebay. This isn't the same as what it's worth, of course. The arguments I've had to have with people, who have claimed adamantly that "I want blah blah for this item, it's worth this amount" - I then take them on ebay, show them - they point excitedly "look! there - they're worth that much. Told you" Where I politely point at the one a few down, and about a quarter of the price, with no bids. Cheapest to sell on ebay recently was £175 - up to £4800 for an 1841 example. Couple of years ago now, but full sovereigns were regularly priced at £225 in the shop I worked at.
Don't forget, certain years of sovereign are more valuable - The Mint only make so many every year, and any unsold at the end of the year were/are melted down, and restruck the following year.
Always get a few valuations, too, before selling. The place I worked at was great - in that it didn't buy and sell, just rented the display cabinet space; so it wasn't in our interests to 'beat the seller down on price or talk/con them into the item being almost worthless, then buy it off them' - any dealer, by definition will have to offer less than its worth, how else can they pay their bills. As you're clearly not just after the money, you simply want to know what you've got, then time is on your side and you can take it at your own pace.
I hope I've spoken some sense, and also hope all goes well with the family rubbish which sadly follows bereavement, as I've found in the last year. All the very, very best.
