So sorry for your loss of your dear friend.
What a year ye have all had.
Both you and your husband sound like such kind people.
Your poor friend knowing she was leaving her children behind.
Great advice above.
Whilst you are luckily comfortably off, with both of you working, life as you know can throw curve balls at you.
Children become unsurprisingly expensive as they grow up, with sports, activities, education, grinds, music lessons, parties, trips, you name it.
You will want what you always planned for your two, so you should look at costs with a very clear eye.
Of course extra activities are optional but having raised 4 myself, totting up the above every year has run into several thousand each, every year.
I repeat, I know extracurricular activities etc are optional, but you need to try and think ahead in that way.
Also you never know when a child might suddenly show a huge aptitude for an instrument or a sport, and suddenly you are looking at a substantial investment. Again choice, but very hard not to want to nurture a gift.
Also transport for 2 to 4 children is more expensive car wise.
A larger house?
Teens take up a lot more space than small children.
Emotionally you and your husband have a big decision but I would not underestimate the future financial commitments.
Working fulltime with 4 children is very different to two.
Every good wish to you and your family as you plan the future.
You have provided priceless stability for those poor children.
Heartbreaking for them to have lost both parents.
I definitely also think some counselling for you and your husband, separately and together would be invaluable and to look into the impact on your own children via a child psychologist would be reassuring.