Your comments aren't 'simple' at all--they're very insightful themselves.

No need to ever feel embarrassed here!
Here are some more letters from Tatiana that show clearly how much of a caretaker she was for Alexandra and how she dreaded causing her mother any more upset or adding to her burdens. Some of her remarks and her closing sound more like Tatiana is the mother. There's also a poignant note from N to A recalling Tatiana's birth and how she may be a balm to them in their old age.

Tatiana Nikolaevna to Aleksandra Fyodorovna, 7 August 1915
Mama darling mine,
….Mama, sweet, I am so awfully sad. I see so little of you. I hate going away for so long. Really, we never see you now. It doesn't matter if sisters go earlier to bed- I'll remain. For me it is better to sleep less and see more of you, my beloved one. God bless you, deary. 1000 kisses to you and Papa dear.
Your own true loving child,
Tatiana
Tsar Nicholas II to Empress Aleksandra, 29 May 1916
[Nicholas reminisces Tatiana’s birth. With the benefit of hindsight, there is something quite bittersweet about N’s remark -- "may God grant that she will be... our consolation in old age!"]
Stavka. 29 May, 1916.
My beloved Wify,
I thank you tenderly for your dear letter. In thought I go back to the event which took place 19 years ago, on the farm in Peterhof! May God bless Tatiana—may God grant that she will remain as good, loving and patient a girl as she is now, and be our consolation in old age!……..
Eternally your
Nicky.
Grand Duchess Tatiana to Empress Aleksandra, March 1912
My sweet darling dear beloved own dearest Mama,
I am so awfully sorry that you wont come with us. I hope that you will feel better tomorrow when we come. Fancy it will be the first time that we will sleep on the Standart it is awfully sad Mama dearest. I hope that Ania will be nice with you and wont tire you and specialy wont come in to you to disturb when you lie or when you want to be alone. Such I petty I could not stay with you Mama dear. It would be such a pleasure to me. I do hope you wont feel too tired. Please Mama darling dont run about the rooms to see how they are. Send Ania or els you will be very tired to receive Auntie and Uncle [apparently Ernie & Onor].I will try and be as good as I con on board with the officers.Goodbye till tomorrow. Dont worry sweety about baby I will look after him and all will be alright. God bless you my sweet own darling.
Many many kisses to you angel from your own loving devoted and true daughter
Tatiana
Tatiana Nikolaevna to Aleksandra, 29 October 1914
[Note the pacifying tone towards Alexandra & attentiveness to her moods. Of the 4 daughters, most witnesses concur in saying that Tatiana was her favorite. "It was not that her sisters loved their mother any less," wrote Pierre Gilliard, "but Tatiana knew how to surround her with unwearying attentions and never gave way to her own capricious impulses." On the few occasions she did, she was quick to offer apologies.]
My sweet darling angel, Mama dear,
I do so hope that you all sleep well and won't feel so tired tomorrow as you will probably do so much the whole day. Please forgive me, my Mama Sweet, if I ever hurt you involuntarily by saying something about your former home, but really if I do say something, it is always without thinking that I can hurt you, or something like that, because really, when I think of you I only think that you are our angel, Mama dear-- a Russian, and always forget that it was not always so, and that you had another home before you came to Papa here. Do forgive me deary. Now goodbye. I pray God give you a good sleep and that you'll be well and happy tomorrow.
1000 kisses to my own darling, sweet, precious Mama, from her ever-loving, thankful, and true daughter,
Tatiana