In answer to your queres;
Blue Jacket`s mother was Mary Bayles, (who later married Andrew Ice),& gave Blue Jacket to his Chief father Hardstriker when he was about 6 years old, he was 6 months older than Tecumseh, & his dad was also Chief Pucksinwah / Hardstriker.
Tecumseh`s mother was Marguerite "Mary" Ice, his father was Chief Pucksinwah aka Chief Hardstriker.
Tecumseh`s mother "Marguerite "Mary" Ice, was first kidnapped by the Mohawk about age 4, & traded to & adopted by the Cherokee Chief, she had full Cherokee status & years later at age 15, was taken captive in a retalitory raid of our Shawnee on the Cherokee, she was then adopted by our Shawnee Turtle Sept Chief, "Methotasa" & she had full Shawnee status & was of the Turtle Sept & married Shawnee`s Panther Sept Chief Puksinwah aka Hardstriker.
Her origional "white family";
Marguerite "Mary" Ice = "Methotasa"
Marguerite "Mary" Ice`s mother Mary Galloway Ice was killed in Mohawk raid, & several Ice children were taken captive.
"Marguerite "Mary" Ice`s white father was Frederick Ice Jr. who was the son of Fredericke Ten Iaac from Holland, "Dutch", but the Ten Isaac`s had previously migrated from Ireland -(Gaelic). Marguerite "Mary"`s mother was Irish also (Gaelic).
So, Tecumseh`s "white" ancestry is from his mother Marguerite "Mary" Ice,aka "Methotasa" & her parents: (Mary Galloway Ice & Frederick Ice Jr.)- would be Tecumseh`s "white" grandparents, from his maternal side.
I hope that this post is helpful for you to put your pieces together.