I haven't done any detailed research on John Tisdale Parker's children, but I've got John Tisdale Parker (m Ella Lee) on census records as follows and perhaps it will help:

24 Jun 1870 (first census John would be on)
63/71 Twp 7, P. O. Garland, Butler Co, AL John Parker 70, wife Charity 67, children William 23, Prudence 27, Martha 25, James 21, Sarah 20, grandsons Gradison 11 (Granderson) & John 9 (prob Granderson's brother Tisdale, both sons of John]

Jun 1880
Unnumbered household Beat 14, Dist 41, Georgiana, Butler Co, AL widowed Charity P 70, daughter Prudence 37, grandsons Granderson 21 & Tisdale (children of son John). Son James B & family in next house.

18 Jun 1900
228/243 Durham, Beat 13, District 21, Garland, Butler Co, AL John T Parker 39, wife Ella 35, children Martha R 15, Laura J 13, George L 10 & John W 8. Ella has had 5 children/4 living

15 Apr 1910
14/14 District 18, Beat 19, McKenzie, Butler Co, AL Tysdel Parker 49, wife Ella 45 (5 children/4 living), children Lonnie 20 & Wilton 15, aunt Prudence M Parker (sister of John making it obvious that one of the boys provided this info to the enumerator)

Like you, I have the 5th child down as an unknown. Could be male or female. Based on the dobs of the other children in this family, I have put this child with a dob of Bet. 1886 - 1889 Butler Co, AL (between Laura & George) and a dod of Bef. 18 Jun 1900 Butler Co, AL. Just my figuring and I'm trying to place it as nearly as I can in the birth order.

Does anyone know where John Tisdale's brother Granderson was after 1880???

And who were Ella Lee's parents??

Lisa in Louisiana