Most of my tags are fully accurate, but I'm adding a note here:
The PC married a woman and she then later died, leaving him a daughter.
So, the girl here is his daughter, but by marriage.
Either an adopted daughter or stepdaughter, but not blood-related.

Edit: For anyone interested in viewing through these, only the first 170 are hentai related.
The rest (459 pics) are miscellaneous game stuff, character reactions, scenery, etc.

Base +4, theMadHatter +12, Raijinken0 +6, Tokizo +6, menghui2000 +6

http://www.getchu.com/soft.phtml?id=644985&gc=gc
Girl on left is step daughter, girl with pink hair is sister in law of hero (his deceased wife's sister)

Base +2, menghui2000 +6

[はにぃま～る] なかだし娘妹（おやこ） ハーレム編～パパのアレを一緒に飲み干してあげたいの～
[Hanimaru] Nakadashi Oyako Harem Hen ～Papa no Are o Issho ni Nomihoshite Agetai no～

Release date: 2008/12/12

Link (VNDB): https://vndb.org/r9018

Base +17

176 ev png

(18禁ゲームCG) [081212] [はにぃま～る] なかだし娘妹（おやこ） ハーレム編～パパのアレを一緒に飲み干してあげたいの～

Base +6

I ask about male:widower tag in forum. a mod tell me that the widow situation has to be told inside the gallery, not from description. so theoritically, to make m:widow tag valid, you could:
1 download the game
2 find the scene that tell that the guy's wife is deceased
3 screenshot that
4 upload that screenshot+what you want from this gallery into a new gallery
That's e-hentai burreucrazy for you
https://forums.e-hentai.org/index.php?s=85685cdb81195f5f3c22a92313066f82&showtopic=199295&st=8660

Base +11