There are 2 books in the The Pyes series. The newest book is Pinky Pye which came out in 2000.

1
Ginger Pye

Book cover of Ginger Pye
A heartwarming, yet quirky, story about a boy called Jerry whose much-loved puppy, Ginger Pye, goes missing. Jerry and his sister begin a desperate hunt for Ginger, who they're convinced has been stolen away by the stranger in the yellow hat. After months of fruitless searching the children are about…
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2
Pinky Pye

By Eleanor Estes , Edward Ardizzone (illustrator),

Pinky Pye
In Pinky Pye, the Pye family adds another member.A furious black kitten abandoned on their doorstep endears itself to the whole family--even Ginger--and foreshadows another addition to the Pye family that will change their lives forever.