 If you liked
Alps no Shoujo Heidi
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 ...then you might like
Flanders no Inu
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Both series are from the same animation-studio, the same animation-style. Both have a "grandpa"^^
Quiet slice of life with great characters. Alps no Shoujo Heidi has a bit of drama, while Flanders no Inu has a lot more drama, even more so in its final stretch.
The two are also similar in storytelling and aesthetics. For those who like quiet Slice of Life, both are a good option.