Yes, sperm is front and center in the the legal docs filed with the court. Nathalie Sorensen, Christian's widow, has dibs on the sperm and can "use however she sees fit."
Nathalie was Christian's longtime GF and married him on his death bed.
Here's the rub. If Nathalie uses the sperm to have kids, they will get the same share of the estate as Christian's living children, which means with each baby they get less.
Nathalie hasn't said whether she'll grow the fam, so for now the sperm sits in a freezer at a cryobank, and his children worry.